Application Protocols

Question 1

What is HTTPS?

Answer 1

• A more secure version of HTTP protocol.
• Which is enables web content access on a browser.

Question 2

What is the HTTP (Hypertext Transfer Protocol)? How does it work?

Answer 2

• HTTP is a protocol used to view website content.
• A request is sent from the URL in a web browser to set up a TCP/IP connection to the webserver and extract the contents of the website.

Question 3

How does email typically work?

Answer 3

• When an email is sent to somebody, the email client will send a message to an email server; if an email address is found within the server it will forward the message to the inbox of the email address.
• If an email address isn’t found in a particular email server it will forward it into another server that will forward it to the inbox of an email address.

Question 4

What is SMTP (Simple Mail Transfer Protocol)?

Answer 4

Is a protocol that forwards the message from one type of email server to another.

Question 5

What protocol is used if it’s web email?

secure version of web browsing

Answer 5

HTTPS

Question 6

What two protocol are used in traditional email clients? And what do they do?

Answer 6

• POP3 (Post Office Protocol) deletes emails from the email server after they’re forwarded to an inbox of an email address. Slightly older protocol.
• IMAP (Instant Message Access Protocol) saves the email on a web server which enables end-users to access emails anywhere. Slightly more modern protocol.

Question 7

Between HTTP, SMTP, POP3, IMAP what are the secure versions of these protocols?

Answer 7

• HTTPS
• SMTPS
• POP3 over TLS (Transport Layer Security)
• IMAPS